Printing-telegraph system



Aug. 18, 1925. 1,549,821 G. s. VERNAM PRINTING TELEGRAPH SYSTEM 7 Filed Sept. 14, 1923 2 Sheets-Sheet 1 Signal Q Y L il /n venfor: GI/barf 5. Verna/1? by 7 Affj Aug. 18, 1925. 1,549,821

7 G. S. VERNAM PRINTING TELEGRAPH SYSTEM Fil ed Sept. 14, 1925 2 Sheets-Sheet 2 EJEI Gi/ber/ S. Verna/77.

by iry Patented Aug. 18, 1925.

UNiTEl) PATENT OFFICE.

GILBERT S. VERNAM, F BROOKLYN. NEW YORK, ASSIGNOR TO AMERICAN TELEPHONE AND TELEGRAPH COIVIPANY, A CORPORATION OF NEW YORK.

PRINTING-TELEGRAPH SYSTEM.

Application filed September 14, 1923.

To all whom it may concern Be it known that I, GILBERT S. VERNAM, residing at Brooklyn, in the county of Kings and State of New York, have invented certain Improvements in Printing- Telegraph Systems, of which the following is a specification.

This invention relates to signaling systems and particularly to printing telegraph systems.

An object of the invention is the provision of means in a synchronous multiplex printing telegraph system responsive to the interruption of the line signals for a period longer than would occur during the normal operation of the system for maintaining synchronism and indicating such interruption to an attendant.

1n accordance with one of the embodiments, the invention contemplates the provision in a printing telegraph system employing continuously rotating distributors which depend for their correction upon line signals, of means responsive to a prolonged open line condition for preventing loss of synchronism and operating suitable indicating mechanism for advising an attendant that the line has failed.

Referring now to the drawings, Figure 1 illustrates one embodiment of the invention while Fig. 2 shows a modification of the arrangement shown in Fig. 1.

A better understanding of the invention may be had from the following description when considered in conjunction with the accompanying drawings.

Referring for the moment to Fig. 1 there is shown an incoming line 5 which extends from a distant central station and terminates at the station shown in this figure. It should be noted here that the system for which the present invention is especially adaptable is of the type commonly referred to as synchronous multiplex systems with extension circuits, that is,a system wherein the message impulses are transmitted over multiplex system and then retransmitted by means of start-stop equipment to branch offices where the messages are recorded and where start-stop equipment is also located. It is, of course, understood that one of the multiplex stations serves as Serial No. 662,678.

the pace setting station while the other stat on is what is termed the corrected station. it is the latter station which has been shown in the present instance.

Connected to the line conductor 5 is a line relay 6 which has connected to its contacts, relays 8, 9, 10 and 11. To the midpoint of the connection of the windings of relay 6 is connected the sending segments of a multiplex distributor 7 which, for the sake of clearness, has been shown diagrammatically as it does not form a part of the present invention. The receiving distributor has been shown in detail and has lts continuous ring connected to the armature of relay 8 and receiving segments con nected to storage devices 16 and 17 also shown diagrammatically. Each of the storage devices 16 and 17 has circuits controlled thereby extending to start-stop distributors 18 and 19 which have their brush arms controlled by release magnets 20 and 21 respectively and which serve to retransmit the impulses received on receiving distributor 15 to the branch lines 22 and 23. This particular part of the system is shown in detail in my copending application Serial N 0. 528,763, filed January 12, 1922, and since only so much of the system as is shown enters into the present invention, a more de' tailed showing is considered unnecessary.

The relay 9 controls through its armature, the application of current in accordance with the operation of the receiving relay 6 to the continuous ring of the correcting section 25 of the distributor for operating a control relay 26 which functions to correct the speed of a tuning fork 27 in accordance with the line signals. The tuning fork 2'7 through its contacts controls the energization of diametrically opposite driving magnets of a LaCour motor 28, the armature of this LaCour motor being connected to a shaft upon which the brush arms of the various sections of the distributor are mounted. As is well understood, the motor 28 serves as a driving means for the brush.

arms of the various distributor sections. This method of correction is fully disclosed in Patent 1,333,000, issued March 9, 1920 and further description of this part of the system is believed unnecessary.

Relays 10 and 11 which are also controlled by the line relay 6 are of the slow-t-oa'elease type as indicated by the arrows being so designed that they will not release their arinatures except upon the happening of a cessa tion of line signals for a period longer than the normal op ration the system, as might be caused by a line failure. ll hen this occurs one or the other of these relays releases its ari'nature for causing the deenergination o't slow-to-release relay 29. This sloW-to-release rela 29 in releasing its armature, opens the energizing circuits of another sloW-l'o-release relay 30 for completing a circuit through the armature and contact of the latter relay for energizing relay 53L Relay 31 disconnects at its arn'iatures the circuits extending from the start segments and of the multiplex distributor the releas magnets 2 and 1 of the startstop distributors l8 and 19 respectively. 'llhus though the distributor 15 continues to be rotated, the sta- 't-stop distributors 18 and 19 will not be released as the circuits for their release magnets are severed at the arinatnres of relay 'lhere is however completed at the upper arinatures of these relays, circuits extending the segments 32 and 33 the distributor 15 to the lefthand ivlndine's of control rel-a 26 whereb o I J .l the control relay A) will be energized upon the passage 01 the brusl oi the distributor 1 15 over the segn'ients and independ 5 71 X or: 1 m 2 n+2 i oi the operation or tlc Cvl scan section .2 of the distributors. lielay 31 also completes \l'S and COlltilCll All 6118igizing circuit for relay ill which, upon being: energizeah causes the operation of a signal lamp 35 and a relay 36 which controls the operation an ihary ialing device such as a hell or llhie si ;naling lovice. The operation or me lainp or toe auxiliary signaling device indicates to the attendant at the niu ipler' or central station that ll has a cessation o1? signals or that the line has tailed. 'lhc attendant l n attempt t loc te the trouble and again set the systen: its normal opera tion "without waiting advised by the o the bran s ol the failure Lamp 2) and relay ay be restored to ionientarily and he systen'i when *cting relay 26 slough its rightreversals in the as impressed on 7 )r wil be released for causing the nit relay 51 which, as prevlously onnccts through its upper arinw tures the hit-hand ndlngs of rel; y 26 to nd 33 of ti e d stributor rents 32 will nov' *eccng relay in and will cause the a 're 5 this relay to Vibrate slowly two positions, each for a a -nis will vary the speed evonztioi iOillCZlllj' iroin i to slow so as to inanitain an average speed approximating that oi lrilmtor at the pace setting s'ation. A illustrates a slightly di rent arent for obtaining substantially the ln general, the operating feathat described in H .erent r slay arrangement has teen 'l'or that shown in i as n'dl method oi controll llelay ll) of 11 !g. L n a small lJU deli rfe ed in series with thr-c and shunted l 1 w nc condenser 1-7! upon the on I "ill haitci u 1 relay a0. tl a lon i is charged neany to its man olcage.

' are both restored to their normal energized condition before relay l0 operates, the condenser will be dis charged to ground through the comparatively low resistance d2. This resistance serves to limit the discharge current and prevents sparking on the contacts of relays and 46.

When relay d0 operates it energizes relay 48 which performs similar functions to the corresponding relay 31 of Fig. 1. l it causes the energization and loaning up of relay 49 which causes the lighting of lamp 50 for communicating the trouble to the attendant. The release of relay i9 is controlled by a key 51.

The speed of the driving fork 52 in the case illustrated, is controlled as in the previous case by the insertion and disconnection of a resistance 56 by the operation of either the control relay or the correcting key 55. When this resistance 56 is in series with the driving magnet of the fork 52, the operating current is reduced and the speed of the driving fork and the motor is slightly increased while when the resistance is short-circuited, the current of the magnet circuit is increased and the fork and motor speed decreased. /Vhen relay 48 operates, it connects a second resistance 53 in parallel with resistance 56 and thereby regulates the current in the driving magnet circuit to a value between that for the fast and slow speeds. Under these conditions, the fork and motor will operate at a speed approximately the same as that of the pace setting distributor.

it may also be desired to disconnect the start circuits of the start-stop distributors as was done in the case of Fig. 1. if this is desired it only becomes necessary to provide additional contacts and armature on relay i8 for accomplishing this result in a manner similar to that previously described in connection with Fig. 1.

Although the invention has been shown as applied to a particular type of system, it is, of course, obvious that it is equally adapt able to other types of systems without departing from the spirit and scope of the present invention.

What is claimed is:

1. A telegraph system comprising a line, synchronous multiplex distributors associated with said line, correcting means responsive to line signals for maintaining synchronism, and means operated when said line signals fail for a period longer than would occur in the normal operation of a printing telegraph system to maintain substantial synchronism independently of any signals transmitted over said line.

A telegraph system comprising a line, synchronous multiplex distributing apparatus associated with said line, correcting means responsive to line signals for maintaining synchronism, and relay means operated when said signals fail for a period longer than would occur in the normal operation of a printing telegraph system to maintain substantial synchronism independently of any signals transmitted over said line.

8. A telegraph system comprising a line, synchronous multiplex distributors associated with said line, correcting means responsive to line signals for maintaining synchronism, means operated when said line signals fail for a period longer than would occur in the normal operation of a printing telegraph system to maintain substantial synchronism independent of the line signals, a

signaling device, and means controlled by' said second recited means for operating said signaling device to communicate to an at tendant the failure of the line signals.

4. A telegraph system comprising a line, a relay connected in said line, synchronous multiplex distributors associated with said relay, correcting means responsive to the operation of said relay by line signals for maintaining synchronism, and slow acting relay means operated only when said relay is caused to engage its contacts for a period longer than would occur in the normal operation of a printing telegraph system for controlling operation of said correcting means to maintain substantial synchronism.

5. A telegraph system comprising a line, a relay connected in said line, synchronous multiplex distributors associated with said relay, correcting means responsive to the op eration of said relay by line signals for maintaining synchronism, slow-to-release means operated when said relay is caused to engage its contacts for a period longer than would occur in the normal operation of a printing telegraph system, and means controlled by said slow-to-release relay means for supplying the correcting impulses to said correcting means independently of the line signals for maintaining substantial synchronism.

6. A telegraph system comprising a line, synchronous multiplex apparatus associated with said line, correcting means responsive to line signals for maintaining synchronism, extension circuits, start-stop distributing apparatus intermediate said multiplex apparatus and said extension circuits and means operated when said line signals fail for a period longe than would occur in the normal operation of a printing telegraph system to control said correcting means to maintain substantial synchronism and prevent the release of said start-stop distributing apparatus.

7. A telegraph system comprising a line, receiving equipment associated with said line, means operated when signals on said line fail for a period longer than the normal operation of the system, and means respon- JJ'C 05 the signals.

8. grz ph syetein eoininising a line, IWCGlVlIlg' equipment associated with said line, an indicating device, and slow-acting relay means responsive when there is a eessation of signals on said line for a period longer than would occur in the normal 0p- L etion of v. printin telegraph system to eeeet the ()pii'fltiifll'l OI said indicating means. "in testimony whereof, have signed my name to this sgeeifiention this 12th day of September 1923.

GILBERT S. VERNAM. 

